Can you post a recent - like "right now" set of test results?

Also - are you using any Tri-Chlor pucks in a floater at all? What else have you addded to the pool - anything?

Also - do you aerate the pool at all? Andy fountains, returns rippling the top of the water, a spa? If not and the cover is on a lot the pool might not be able to "out-gas" which would keep the PH from rising (Chemgeek can help you here).